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Egyptian Auslaufuhr from Thebes in 1400 BC

If you have the time can not stop, so people want it yet measure at least. They invented for this purpose different methods. One of the lesser known methods is the Auslaufuhr. This clock measures time by means of the water. One therefore speaks of a water meter.

Unlike sundials that can be used only when the sun is shining, the water meter may specify a time at night. But this method has other disadvantages, for example, it is not applicable for cold Temperatures, since then the water freezes.

By their nature, the Auslaufuhr, as well as the sundial, a Elementaruhr as it is measured by means of the elements. Here, the Auflaufuhr is only one type of water meters, although the most commonly used.

were called in Greece, the water clocks Klepsydren to German is the "water thieves". Obviously they knew even then the phenomenon of the time thieves. Well, the Klepsydren the scapegoats that were needed if we bypassed unwise with his time!

Even the Romans were the water meters in common use, especially in the daily activities and because they were largely independent of the weather, with the onset of frost began to freeze over, however, the tubes and so the timing was inaccurate. The vessels were then heated with torches or you replaced the water with mercury freezes at -38 ° C.

When Auslaufuhr were on the inside of a vessel scales of hours are the hours could be read. The vessel was filled with water that drips from a small opening again. There were still a problem, for while the annual race was the day and the night times of different lengths, thus had more or less hours. Therefore, we tinkered several scales for each vessel, which took into account the under adverse lengths of day and night periods for each month.

usually used to dull the watch the shape of a cone, because so was the water flow out from the bottom opening evenly. had

The importance of water meters at that time, one also detects in the language in which they played a role. In court they were used to limit the speaking time allotted. Tacitus, therefore, called the water clocks "reins of eloquence." If we had running water dam, you had to like the water clock "aquam sustine" to stop the water flow. If the market women blurted on the market their hours, then called "lose their water," one that aquam perdere. And if somewhere a drain was blocked, it was clear: "Aqua heretics", the water freezes, the orifice is clogged!

were the basis of the use of the water meter generalized these terms, then, and to other Areas of life transmitted.

Above: Shows an ancient Egyptian Auslaufuhr from Thebes in 1400 BC A copy operation is in an astronomy and physics exhibition, National Art Collection Kassel, Hessisches Landesmuseum.